The attached pictures show the Golby electric windshield wiper
conversion
kit installed in my '77 Kingsley. The kit was very complete with
good instructions
and the installation was straight-forward.....took me about 5 hours
including a lunch break.
Cost was $446 plus shipping.

Picture 1 shows the control knob which replaces the OEM slide
leaver.
Push the
button for the washer. Knob controls intermittant setting plus
several continuous speeds.